Even though alexandra could talk to her friends during dance class, she couldn't sing the songs. which best describes her heart rate during this activity?

a- low
b- moderate
c- vigorous
d- dangerous

Anyone who can chat with me right now? i m very bored.

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

The dietary guidelines for americans recommend (a) avoiding smoking. (b) engaging in aerobic exercise for 60 minutes at least five days a week. (c) making all of your grain choices whole grains. (d) increasing your intake of fruits and vegetables.